Die cut roll

ABSTRACT

A die cut roll includes a rotary driving roll having projecting pressure cutting blades on a surface thereof formed in accordance with the shape of a product to be cut to thereby form a die cutter and an anvil roll adapted to receive an edge of each of the projecting pressure cutting blades of the die cutter. The rotary driving roll includes inclined finishing surfaces formed adjacent to a top smooth portion of an edge of each of the projecting pressure cutting blades by a grinding process so that the inclined finishing surfaces have grinding flaws which make an angle φ of 50°-90° to ridgelines defining the top smooth portion.

TECHNICAL FIELD

This invention relates to a die cut roll used to cut sheet typeproducts, such as paper diapers and sanitary napkins.

BACKGROUND OF THE INVENTION

This die cut roll comprises a combination of a die cutter formed byproviding projecting pressure cutting blades, which are formed inaccordance with the shape of a sheet type product to be cut, on asurface of a rotary driving roll, and an anvil roll. A sheet type workto be cut is made to run between the two rolls, and the die cutter isrotated in an anvil roll-pressing manner so as to cut the sheet typework to a predetermined shape with the projecting pressure cuttingblades.

Many attempts have heretofore been made to improve the cutting qualityof the cutting blades and prolong the lifetime thereof. For example,Japanese Patent Registration No. 2593570 discloses that the relationbetween the hardness of pressing ends of cutting blades and that of asurface of an anvil roll has influence upon the lifetime of the cuttingblades, and that, when a hardness difference therebetween is set to morethan 0.1, the lifetime of the cutting blades increases more than tentimes. Japanese Patent Laid-Open No. 227798/1995 discloses the selectionof specific materials for creating a proper hardness difference.

Japanese Patent Laid-Open No. 71999/1996 discloses the prolonging of thelifetime of cutting blades with respect to the shape thereof, i.e., itdiscloses the possibility of increasing the lifetime of cutting bladesby setting the cutting blade width of an axial portion thereof smallerthan that of a circumferential portion thereof. Japanese PatentLaid-Open No. 72000/1996 discloses crowned die cutters provided in botha die cut roll of a two-shaft driving system in which an anvil roll isdriven by two synchronously rotated shafts, and a die cut roll of asingle-shaft driving system in which a die cutter alone is driven withan anvil roll driven thereby.

Japanese Patent Laid-Open No. 267299/1997 discloses the techniques forimproving the cutting quality of cutting blades without spoiling thestrength thereof, by setting the angles α, β (apex angle becomes α+β) oftwo inclined surfaces of each edge of the cutting blades with respect toa radius vector to α≠β, 0≦α≦60°, 25≦β≦80° and 5≦β−α≦80°.

The mode of abrasion of a die cut roll is complicated, and variousthings cause imperfect cutting of a work, chipping of projectingpressure cutting blades, early deterioration of the cutting performanceof edges of the projecting pressure cutting blades and a decrease in thelifetime thereof to occur. Moreover, die cut rolls of different drivingsystems have greatly different modes of abrasion of a die cutter and ananvil roll, i.e., in a certain driving system, non-uniform abrasion ofthe rolls occurs, or a decrease occurs in the lifetime of the edge ofthe cutting blades ascribed to the chipping thereof. When the projectingpressure cutting blades on the surface of the die cutter are formeddiscontinuously in the rotational direction thereof, an extreme repeatedstress is exerted on the pressure cutting blades, and a rate of abrasionthereof increases, so that the imperfect cutting of a work and thechipping of the pressure cutting blades occur. Even when the projectingpressure cutting blades are provided over the entire circumferentiallycontinuous portion of the die cutter with the axial cutting lengththereof decreasing due to the shape of the same, the concentration ofstress on the blades causes an increase in the rate of abrasion thereofand the chipping thereof.

OBJECTS AND SUMMARY OF THE INVENTION

An object of the present invention is to provide a die cut roll havingan improved cutting performance of the edges of projecting pressurecutting blades and a prolonged lifetime.

Another object of the present invention is to provide a die cut rollcapable of resisting the stress occurring when an edge of a projectingpressure cutting blade and an anvil roll are brought into contact witheach other adjacent to a top smooth portion of the edge.

Still another object of the present invention is to provide a die cutroll which has attained a long lifetime thereof with respect to greatlydifferent modes of abrasion of a die cutter and an anvil roll occurringdue to different die cut roll driving systems in use.

A further object of the present invention is to provide a die cut rollwhich has attained the reduction of stress concentration on projectingpressure cutting blades used for cutting a work to a final shape.

A first embodiment of this invention is directed to a die cut rollhaving inclined finishing surfaces of less than 0.1 μm in a surfaceroughness Ra on ridge surfaces adjacent to a top smooth portion of eachprojecting pressure cutting blade, or inclined finish surfaces havinggrinding muscles extending at 50°-90° and preferably 80°-90° withrespect to ridge lines defining the top smooth portion, a surfaceroughness Ra being set to preferably less than 0.3 μm when the grindingmuscle-carrying inclined finishing surfaces are formed.

Another embodiment is directed to a die cut roll, wherein one or both ofa width and an apex angle of each projecting pressure cutting bladeformed so as to extend in the axial direction of a die cutter is setsmaller than those of each projecting pressure cutting blade formed soas to extend in the circumferential direction of the die cutter,preferably a width da and an apex angle θ a of an edge of the axiallyformed projecting pressure cutting blade, and a width dc and an apexangle θ c of an edge of the circumferentially formed one being set to5≦da≦10 μm, 60≦θ a≦120°, 10≦dc≦30 μm, 80≦θ c≦140°, and θ a≦θ c.

For driving the die cut roll consisting of a die cutter and an anvilroll, two types of driving system can be adopted. One is the two-shaftdriving type in which the driving force of a motor is transmitted toboth shafts of the die cutter and the anvil roll by means of a gear torotate the die cutter and the anvil roller synchronously. The other isthe single-shaft driving type in which the driving force is transmittedto the shaft of the die cutter and the anvil roller which is in contactwith the die cutter and is aligned in parallel with the axis of theshaft of the die cutter and is rotated by the friction with the diecutter.

Another embodiment of this invention is directed to a die cut rollhaving a difference between the hardness of a die cutter and that of ananvil roll with respect to above cut roll driving type, concretelyspeaking, H₁ representative of a hardness (H_(R)A) of at least an edgeside portion of a cutting blade of a die cutter and H₂ representative ofa hardness (H_(R)A) of at least an outer surface of an anvil rollsatisfying the conditions 82≦(H₁, H₂)≦96(H_(R)A) respectively, and0<H₂−H₁<5 when a two-shaft driving type die cutter is employed, and−5<H₂−H₁<1 when a single-shaft driving type die cutter is employed.

A further embodiment of this invention is directed to a die cut rollprovided with projecting pressure cutting blades not directly working tocut a product, i.e. so-called supporting blades in addition to properprojecting pressure cutting blades, which are formed in accordance withthe shape of products to be cut, so as to compensate for at leastcircumferentially non-continuous portions or axially cuttinglength-decreasing portions of the proper projecting pressure cuttingblades.

The projecting pressure cutting blades for products of a die cutter maybe provided so that the blades extend continuously in thecircumferential direction of the die cutter, or so that end portions ofthe blades overlap in the circumferential direction thereof.

The materials out of which the die cutter and anvil roll can be formedinclude hard materials, such as a sintered hard alloy inclusive of a WCbased alloy, a cermet inclusive of a Ti based alloy, high speed steel,and a ceramic material of Al₂O₃.ZrO₂.SiC.Si₃N₄, out of which hardmaterials of carbide bond, such as the WC based alloy and Ti based alloyin particular are preferably used.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an example of a die cut roll to which the present inventionis applied;

FIG. 2 shows the shape of an edge of a projecting pressure cutting bladeprovided on a surface of a die cutter of Embodiment 1 and which extendsin an axial direction of the die cutter;

FIG. 2A shows the shape of an edge of a projecting pressure cuttingblade provided on a surface of a die cutter of Embodiment 1 and whichextends in a circumferential direction of the die cutter;

FIG. 3 shows an example of a two-shaft driving type die cut roll towhich the present invention is applied;

FIG. 4 shows an example of a single-shaft driving type die cut roll towhich the present invention is applied;

FIG. 5 shows the relation between a hardness difference and lifetime ofthe two-shaft driving type die cut roll;

FIG. 6 shows the relation between a hardness difference and lifetime ofthe single-shaft driving type die cut roll;

FIG. 7 shows an example of a die cutter in the present invention,provided with projecting pressure cutting blades not directly working tocut a product, so-called supporting blades in addition to properprojecting pressure cutting blades;

FIG. 8 shows another example of a die cutter in the present invention,having another type of supporting blades;

FIG. 9 shows still another example of a die cutter in the presentinvention, having parts substitutable for the supporting blades; and

FIG. 10 shows a further example of a die cutter in the presentinvention, having another type of parts substitutable for the supportingblades.

The descriptions of the reference numerals and letters shown in thedrawings are as follows.

1 . . . Projecting pressure cutting blades, 2 . . . Die cutter, 3 . . .Anvil roll, 2 a . . . Die cutter gear, 3 a . . . Anvil roll gear, 4 . .. Top smooth portion, 5 . . . Inclined grinding surface, 6 . . .Sintered ground, 7 . . . Inclined finishing surface, 8 . . . Grindingflaws, 9 . . . Motor, 10 . . . Supporting blades, 11 . . . Guideflanges, 12 . . . Continuous portion of a projecting pressure cuttingblade, d . . . Width of a top smooth portion of a blade, θ . . . Apexangle of an edge, A . . . Product cutting regions, P . . . Work (objectto be processed), X . . . Circumferential discontinuous portions ofprojecting pressure cutting blades, Y . . . Concentrated portion withrespect to the axial direction of a projecting pressure cutting blade, Z. . . Range including circumferential end portions of a plurality ofprojecting pressure cutting blades.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1

A die cut roll shown in FIG. 1 has a die cutter 2 formed by providing asurface of a rotary driving roll with a projecting pressure cuttingblade 1 formed in accordance with the shape of products to be cut, andan anvil roll 3 disposed under the die cutter and adapted to receive anedge of the projecting pressure cutting blade, and a sheet type work Pto be cut is made to run between the two rolls and cut to apredetermined shape with the projecting pressure cutting blade 1 byrotating under pressure the die cutter 2 against the anvil roll 3.

The projecting pressure cutting blade 1 shown in FIG. 1 is provided asshown in FIG. 2 with a top smooth portion 4, and inclined finishingsurfaces 7 ground at right angles to the longitudinal direction of thetop smooth portion 4. Each inclined finishing surface 7 is formed sothat an angle φ thereof with respect to a relative ridgeline forming thetop smooth portion 4 is in the range of 50°-90°, preferably 80°-90°, andit has grinding flaws 8. The inclined finishing surfaces 7 are finishedto a surface roughness Ra of less than 0.3 μm.

An apex angle θ made by the top smooth portion 4 having an edge width dat an edge of the projecting pressure cutting blade 1, and inclinedfinishing surfaces 7 which are symmetrical about the top smooth portion4 is set so as to satisfy the following specific conditions. Moreover,the edge width da of the top smooth portion 4 and the apex angle θa madeby the symmetrical, inclined finishing surfaces 7 in the axial directionof the die cutter 2 (see FIG. 2) and those in the circumferentialdirection thereof which is perpendicular to the axial direction (seeFIG. 2A, the edge width being designated dc and the apex angle beingdesignated θc) are preferably set to different values.

The specific conditions are as follows.

5 μm≦Axial edge width da≦10 μm

60°≦Axial apex angle θa≦120°

10 μm≦Circumferential edge width dc≦30 μm

80°≦Circumferential apex angle θc≦140°

Axial apex angle θa≦Circumferential apex angle θc

Out of these conditions, the axial blade width d in the axial directionof the die cutter has to be set small so as to obtain a required contactsurface pressure. However, when this axial blade width is smaller than 5μm, the chipping of the projecting pressure cutting blade occurs, sothat it is preferably in the above-mentioned range. Since the contactsurface pressure is high in the circumferential direction of die cutter,there is a possibility of chipping of the projecting pressure cuttingblade. Therefore, the circumferential blade width dc has to be setlarge.

The axial edge apex angle θa is set to 120° or a lower level so that theedge width does not greatly increase due to the abrasion of the edge.However, when this apex angle is not more than 60°, the chipping of theedge becomes liable to occur. Since the contact surface pressure in thecircumferential direction of the die cutter is high, there is apossibility of occurrence of the chipping of the edge, so that thecircumferential edge apex angle θc has to be set large.

An about 1 mm thick polyethylene film as a work for obtaining sanitarynapkins was cut by using the die cut roll according to the presentinvention. The edge widths d in the axial direction (da) and in thecircumferential direction perpendicular thereto (dc) were set to 10 μmand 20 μm respectively, and the axial and circumferential apex angles,θa and θc, respectively, were set to 100° and 110° respectively. Asimilar film was cut to a predetermined shape by using a conventionaledge having the same axial and circumferential edge widths da and dc of20 μm and apex angles θa and θc of 90°. These two film cuttingoperations were compared with each other by using a die cut rollcomprising a combination of a die cutter and an anvil roll, both ofwhich were formed out of a WC—Co sintered hard alloy.

According to this embodiment, the anvil roll pressing cycle in thepresent invention was lengthened as compared with that in theconventional die cut roll, and a long lifetime, which was about 1.5times as large as that of the conventional die cut roll, could beattained.

This effect was, for one thing, ascribed to the inclined finishingsurfaces 7 of a surface roughness Ra of less than 0.3 μm formed betweenthe top smooth portion 4 and inclined grinding surfaces 5 of the edge ofthe projecting pressure cutting blade 1 of the die cutter so that theinclined finishing surfaces 7 were ground to form grinding flawsextending at 50°-90°, and preferably 80°-90° with respect to theridgelines of the top smooth surface portion 4. This effect was alsoascribed to the compounded specific conditions for the width and apexangle of the edge. It was also ascertained that, even when therespective conditions were utilized independently, different effectswere obtained, though the levels thereof were various.

When the direction in which the inclined finishing surfaces are groundis not perpendicular to the ridgelines of the top smooth portion 4, thesame effect can also be obtained by setting the surface roughness Ra toless than 0.1 μm. The reason resides in that setting the surfaceroughness Ra of the inclined finishing surface to less than 0.1 μmserves to eliminate the microscopic notches which cause the minutechippings of the projecting pressure cutting blade to occur.

Embodiment 2

In this embodiment, die cutters 2 and anvil rolls 3 all of which wereformed out of a WC—Co sintered hard alloy were used, in whichcompounding ratios of WC were varied to set the hardness of at least thetop side portions of projecting pressure cutting blades 1 on the diecutter rolls 2 and that of at least the roll surfaces of the anvil rolls3 to different levels, whereby die cutters and anvil rolls which haddifferent hardness differences were provided for different drivingsystems employed.

Referring to FIG. 3 showing an example of die cut roll of a two-shaftdriving system, a driving shaft of a motor 9 directly drives a diecutter 2, and a die cutter gear 2 a drives an anvil roll gear 3 a, adriving shaft connected to the anvil roll gear 3 a driving an anvil roll3 synchronously, whereby a sheet type work P passing between the diecutter 2 and anvil roll 3 is cut to a shape in accordance with that of aprojecting pressure cutting blade 1.

The die cutter 2 and anvil roll 3 were formed so that the relationalexpression 0<H₂−H₁<5 wherein 82≦(H₁, H₂)≦96(H_(R)A) is established,wherein H₁ represents the hardness (H_(R)A) of at least the top sideportion of the projecting pressure cutting blade 1, and H₂ the hardness(H_(R)A) of at least the surface of the anvil roll.

The relation between a difference (H₂−H₁) between the hardness(H_(R)A)H₁ of the top side portion of the edge of the die cutter 2 inthe two-shaft driving system of FIG. 3 and that (H_(R)A)H₂ of the anvilroll 3, and the lifetime of the test machines manufactured with thehardness differences (H_(R)A) set to various levels is shown in the formof a lifetime curve of die cut rolls in FIG. 5. The ideal die cutterlifetime curve and ideal anvil roll lifetime curve are lifetime curvesobtained when the die cut rolls are operated without encountering theabrasion of the anvil rolls and die cutters.

The reason for attaining the relational expression 0<H₂−H₁ resides inthe following. When the projecting pressure cutting blade 1 of the diecutter 2 is harder than the anvil roll 3, the pressing force isconcentrated on the surface of the anvil roll 3 to wear the same.Especially, when the die cutter and anvil roll are rotatedsynchronously, abrasion occurs in a concentrated manner on the portionsof the surface of the anvil roll 3 which the cutting blade 1 of the diecutter 2 contacts, so that the lifetime of the die cut roll decreases tosuch a level that gives rise to practical problems. Furthermore, thetenacity of the edge of the die cutter 2 relatively decreases ascompared with that of the anvil roll 3, and this causes the chipping ofthe edge of the die cutter 2 to occur.

The reason why the difference H₂−H₁ was set to H₂−H₁<5 resides in thefollowing. When H₂−H₁ is set larger than 5, the hardness of the diecutter 2 becomes too low as compared with that of the anvil roll 3, andthe abrasion of the edge of the die cutter 2 becomes liable to occurwith the lifetime thereof decreasing to such a level that gives rise topractical problems.

Referring to FIG. 4 showing an example of a die cut roll of asingle-shaft driving system to which the present invention is applied, adie cutter and an anvil roll were formed so that the relationalexpression −5<H₂−H₁<1 wherein 82≦(H₁, H₂)≦96(H_(R)A) is established,wherein H₁ represents the hardness (H_(R)A) of at least a top sideportion of a projecting pressure cutting blade 1 of the die cutter, andH₂ the hardness (H_(R)A) of at least the surface of the anvil roll.

The relation between a difference (H₂−H₁) between the hardness(H_(R)A)H₁ of the top side portion of the edge of the die cutter 2 inthe single-shaft driving system of FIG. 4 and that (H_(R)A)H₂ of theanvil roll 3, and the lifetime of the test machines manufactured withthe hardness differences (H_(R)A) set to various levels is shown in FIG.6.

As compared with the case of the die cut roll of a two-shaft drivingsystem, a load is imparted to the projecting pressure cutting blade 1while the die cutter frictionally drives the anvil roll 3 via the workP, so that the lifetime of the die cut rolls of a single-shaft drivingsystem generally decreases. The lifetime of the anvil rolls 3 generallyincreases since the abrasion spreads over the whole surface of eachthereof to cause an abrasion rate to decrease. When the hardnessdifference is set in the range of −5<H₂−H₁, the lifetime of the die cutroll reaches a maximum level.

The reason why the hardness difference was set to −5<H₂−H₁ resides inthe following. When the hardness difference H₂−H₁ is set smaller than−5, the abrasion rate of the anvil roll 3 becomes markedly high ascompared with that of the die cutter 2 to cause the lifetime thereof todecrease, and the tenacity of the projecting pressure cutting blade 1 ofthe die cutter 2 decreases as compared with that of the anvil roll 3 tocause the edge of the projecting pressure cutting blade 1 to be chipped.

The hardness difference was set to H₂−H₁<1 because, when H₂−H₁ is setlarger than 1, the hardness of the die cutter 2 becomes excessively lowas compared with that of the anvil roll 3, and the wear on the edge ofthe cutting blade of the die cutter 2 becomes liable to occur.

Embodiment 3

This embodiment was provided with supporting blades, which did notdirectly serve to cut products, in addition to the projecting pressurecutting blades provided on the above embodiments. The provision of thesupporting blades enables the concentration of excessively largerepeated stress on the edge of the projecting pressure cutting blades tobe lessened.

Referring to FIG. 7, a die cutter 2 having guide flanges 11 oncircumferential portions of both ends thereof is provided withprojecting pressure cutting blades 1 formed in accordance with the shapeof paper products to define product cutting regions A on the inner sidesthereof. 10 denotes projecting pressure cutting blades not directlyworking to cut products of the present invention, i.e. so-calledsupporting blades provided besides the product-obtaining projectingpressure cutting blades 1. The supporting blades 10 are provided so asto compensate for a circumferentially discontinuous portion shown by Xof the rotary driving roll body so as to extend in the circumferentialdirection thereof. The supporting blades 10 are formed of the samematerial as the projecting pressure cutting blades 1 so that the shapeand height of the edges become the same as those thereof since stablecutting characteristics can be obtained by setting the abrasion rate ofthe waste blades substantially equal to that of the projecting pressurecutting blades 1. When a distance between the supporting blades iswithin the range of levels lower than that of the width of work paper Pwith the length of the former within the range of levels higher thanthat of the circumferential size of the discontinuous portion X of thedie cutter 2, the excessively large repeated stress can be lessened, andthe abrasion rates of the projecting pressure cutting blades 1 andsupporting blades 10 can be set substantially equal, so that this diecut roll is advantageous in cutting performance and economicalefficiency.

The supporting blades 10 may be provided in more than two axial rows orformed to an arcuate shape.

Embodiment 4

FIG. 8 shows a modified example of the supporting blades 10 of FIG. 7,which are provided on a die cutter 2, to which the present invention isapplied, having two projecting pressure cutting blades 1 crossing eachother to form continuous blades. Referring to FIG. 8, the supportingblades 10 are formed so as to compensate for an axially concentratedportion shown by Y of the projecting pressure cutting blades 1. Theprovision of these supporting blades 10 enables stress occurring due toa difference between the peripheral speed of the die cutter and that ofthe anvil roll and the feeding of a work to be lessened.

Embodiment 5

FIG. 9 shows an example provided with a continuous portion 12 formed ona die cutter 2 having two projecting pressure cutting blades 1 crossingeach other, instead of providing such an independent supporting blades10 as shown in FIG. 8, so as not to form a stress concentrated portion.This continuous portion 12 comprises not a one-point cross of theprojecting pressure cutting blades 1 having product cutting regions Abut a linear continuous cross thereof elongated in the axial directionof the cutter roll. This continuous portion 12 extending in the axialdirection of the die cutter 2 may also be formed so as to includecircumferentially extending sections, or so as to extend in thecircumferential direction, for the purpose of preventing the formationof a stress concentrated portion. This enables the concentrtation of anexcessively large repeated stress on the two projecting pressure cuttingblades 1 to be lessened.

Embodiment 6

FIG. 10 shows another example which is not provided with supportingblades either just as Embodiment 5, and which is provided withprojecting pressure cutting blades 1 so as to extend in the direction ofthe whole circumference of the die cutter for the purpose of preventingthe formation of a stress concentrated portion. In the example of FIG.10, plural projecting pressure cutting blades 1 formed in accordancewith the shape of products to be cut are arranged side by side in thecircumferential direction of a die cutter. These projecting pressurecutting blades 1 are disposed side by side circumferentially in a rangeZ including at least their respective circumferential end portions, sothat stress concentration on the circumferential end portions of thecutting blades can be avoided.

In Embodiments 5 and 6, supporting blades 10, which were provided inEmbodiments 3 and 4 besides the projecting pressure cutting blades 1,can, of course, be used additionally.

INDUSTRIAL APPLICABILITY

A die cut roll of a long lifetime can be provided which is capable ofpreventing the occurrence of minute chippings of the edges of theaxially extending projecting pressure cutting blades, and maintaining acutting performance even when the width of the edges increases due tothe abrasion of the top smooth portions.

A die cut roll of a long lifetime which has a long pressing cycle,especially, in an initial operating period can be provided.

A die cut roll having a lasting cutting quality without encounteringabnormal abrasion of the edges of the cutting blades, can be provided.

The prevention of the chipping of edges of the cutting blades and theprolongation of the lifetime of a die cut roll, which are necessary tomaintain a required shape of edges on contact surfaces of the cuttingblades, can be attained by reducing the width of the edges of theprojecting pressure cutting blades extending in the axial direction of acutter.

What is claimed is:
 1. A die cut roll comprising a rotary driving rollhaving projecting pressure cutting blades on a surface thereof formed inaccordance with the shape of a product to be cut to thereby form a diecutter, and an anvil roll adapted to receive an edge of each of saidprojecting pressure cutting blades of said die cutter, said rotarydriving roll comprising inclined finishing surfaces formed adjacent to atop smooth portion of an edge of each of said projecting pressurecutting blades by a grinding process so that said inclined finishingsurfaces have grinding flaws which make an angle φ of 50°-90° toridgelines defining said top smooth portion.
 2. A die cut roll accordingto claim 1, wherein a surface roughness Ra of said inclined finishingsurfaces is less than 0.3 μm.
 3. A die cut roll according to claim 1,wherein said projecting pressure cutting blades extend in axial andcircumferential directions of said rotary driving roll, at least one ofan edge width and an apex angle of said projecting pressure cuttingblades extending in the axial direction of said rotary driving rollbeing smaller than a corresponding one of an edge width and an apexangle of said projecting pressure cutting blades extending in thecircumferential direction of said rotary driving roll.
 4. A die cut rollaccording to claim 3, wherein the edge width, designated da, and apexangle, designated θa, of said projecting pressure cutting bladesextending in the axial direction of said rotary driving roll and theedge width, designated dc, and apex angle, designated θc, of saidprojecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll satisfy the conditions 5≦da≦10 μm,60≦θa≦120°, 10≦dc≦30 μm, 80≦θc≦140°, and θa≦θc.
 5. A die cut rollaccording to claim 1, wherein a hardness difference is given to at leastthe top side portions of said cutting blades of said die cutter and atleast a roll surface of said anvil roll, said hardness difference beingset to different levels between a die cut roll of a two-shaft drivingtype die cutter and a die cut roll of a single-shaft driving type diecutter.
 6. A die cut roll according to claim 5, wherein, when said diecutter and said anvil roll are driven by two shafts, the relationalexpression 0<H₂−H₁<5 wherein 82≦(H₁, H₂)≦96 (H_(R)A) is established,wherein H₁ represents the hardness (H_(R)A) of at least a top sideportion of said cutting blade of said die cutter, and H₂ the hardness(H_(R)A) of at least the roll surface of said anvil roll.
 7. A die cutroll according to claim 5, wherein, when said die cutter and said anvilroll are driven by a single shaft, the relational expression −5<H₂−H₁<1wherein 82≦(H₁, H₂)≦96 (H_(R)A) is established, wherein H₁ representsthe hardness (H_(R)A) of at least a topside portion of said cuttingblade of said die cutter, and H₂ the hardness (H_(R)A) of at least theroll surface of said anvil roll.
 8. A die cut roll according to claim 1,further comprising supporting blades arranged on a region of said rotarydriving roll which covers circumferentially discontinuous portions ofsaid product cutting projecting pressure cutting blades, said supportingblades extending in a circumferential direction of said rotary drivingroll.
 9. A die cut roll according to claim 8, wherein said supportingblades cover at least concentrated portions with respect to the axialdirection of said rotary driving roll of said product cutting projectingpressure cutting blades.
 10. A die cut roll according to claim 8,wherein said supporting blades extend in the direction of the entirecircumference of said rotary driving roll.
 11. A die cut roll accordingto any one of claims 8-10, wherein the hardness (H_(R)A)H₁ of a top sideportion of each of said supporting blades is in the range of 82≦H₁≦96.12. A die cut roll according to any one of claims 8-10, wherein thehardness (H_(R)A)H₁ of the top side portion of each of said productcutting projecting pressure cutting blades formed in accordance with theshape of a product to be cut is in the range of 82≦H₁≦96.
 13. A die cutroll according to claim 1, wherein: product cutting regions of saidprojecting pressure cutting blades are disposed side by side in thecircumferential direction of said rotary driving roll.
 14. A die cutroll according to claim 1, wherein said inclined finishing surfaces havegrinding flaws which make an angle φ of 80°-90° to the ridgelinesdefining said top smooth portion.
 15. A die cut roll according to claim1, wherein said projecting pressure cutting blades extend in axial andcircumferential directions of said rotary driving roll, an edge width ofsaid projecting pressure cutting blades extending in the axial directionof said rotary driving roll being smaller than an edge width of saidprojecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll and an apex angle of saidprojecting pressure cutting blades extending in the axial direction ofsaid rotary driving roll being smaller than an apex angle of saidprojecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll.
 16. A die cut roll comprising arotary driving roll having projecting pressure cutting blades on asurface thereof formed in accordance with the shape of a product to becut to thereby form a die cutter, and an anvil roll adapted to receivean edge of each of said projecting pressure cutting blades of said diecutter, said rotary driving roll comprising inclined finishing surfacesformed adjacent to a top smooth portion of an edge of each of saidprojecting pressure cutting blades by a grinding process so that saidinclined finishing surfaces make an angle φ of 50°-90° to ridgelinesdefining said top smooth portion, said projecting pressure cuttingblades extending in axial and circumferential directions of said rotarydriving roll, at least one of an edge width and an apex angle of saidprojecting pressure cutting blades extending in the axial direction ofsaid rotary driving roll being smaller than a corresponding one of anedge width and an apex angle of said projecting pressure cutting bladesextending in the circumferential direction of said rotary driving roll.17. A die cut roll according to claim 16, wherein the surface roughnessRa of said inclined finishing surfaces is less than 0.3 μm.
 18. A diecut roll according to claim 10 or 17, wherein the edge width, designatedda, and apex angle, designated θa, of said projecting pressure cuttingblades extending in the axial direction of said rotary driving roll andthe edge width, designated dc, and apex angle, designated θc, of saidprojecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll satisfy the conditions 5≦da≦10 μm,60≦θa≦120°, 10≦dc≦30 μm, 80≦θc≦140°, and θa≦θc.
 19. A die cut rollaccording to claim 10, wherein said inclined finishing surfaces havegrinding flaws which make an angle φ of 80°-90° to the ridgelinesdefining said top smooth portion.
 20. A die cut roll according to claim16, wherein an edge width of said projecting pressure cutting bladesextending in the axial direction of said rotary driving roll is smallerthan an edge width of said projecting pressure cutting blades extendingin the circumferential direction of said rotary driving roll and an apexangle of said projecting pressure cutting blades extending in the axialdirection of said rotary driving roll is smaller than an apex angle ofsaid projecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll.
 21. A die cut roll comprising arotary driving roll having projecting pressure cutting blades formed inaccordance with the shape of a product to be cut to thereby form a diecutter, and an anvil roll adapted to receive an edge of each of saidprojecting pressure cutting blades of said die cutter, said rotarydriving roll comprising inclined finishing surfaces having a surfaceroughness Ra of less than 0.1 μm formed on ridgeline—including surfaceportions adjacent to a top smooth portion of an edge of said projectingpressure cutting blade, said projecting pressure cutting bladesextending in axial and circumferential directions of said rotary drivingroll, at least one of an edge width and an apex angle of said projectingpressure cutting blades extending in the axial direction of said rotarydriving roll being smaller than a corresponding one of an edge width andan apex angle of said projecting pressure cutting blades extending inthe circumferential direction of said rotary driving roll.
 22. A die cutroll according to claim 21, wherein the edge width, designated da, andapex angle, designated θa, of said projecting pressure cutting bladesextending in the axial direction of said rotary driving roll and theedge width, designated dc, and apex angle, designated θc, of saidprojecting pressure cutting blades extending in the circumferentialdirection of said rotary driving roll satisfy the conditions 5≦da≦10 μm,60≦θa≦120°, 10≦dc≦30 μm, 80≦θc≦140°, and θa≦θc.
 23. A die cut rollaccording to claim 21, wherein an edge width of said projecting pressurecutting blades extending in the axial direction of said rotary drivingroll is smaller than an edge width of said projecting pressure cuttingblades extending in the circumferential direction of said rotary drivingroll and an apex angle of said projecting pressure cutting bladesextending in the axial direction of said rotary driving roll is smallerthan an apex angle of said projecting pressure cutting blades extendingin the circumferential direction of said rotary driving roll.
 24. A diecut roll comprising a rotary driving roll having projecting pressurecutting blades on a surface thereof formed in accordance with the shapeof a product to be cut to thereby form a die cutter, and an anvil rolladapted to receive an edge of each of said projecting pressure cuttingblades of said die cutter, said rotary driving roll comprising inclinedfinishing surfaces formed adjacent to a top smooth portion of an edge ofeach of said projecting pressure cutting blades so that said inclinedfinishing surfaces have flaws which make an angle φ of 50°-90° toridgelines defining said top smooth portion.
 25. A die cut rollcomprising a rotary driving roll having projecting pressure cuttingblades on a surface thereof formed in accordance with the shape of aproduct to be cut to thereby form a die cutter, and an anvil rolladapted to receive an edge of each of said projecting pressure cuttingblades of said die cutter, said rotary driving roll comprising inclinedfinishing surfaces formed adjacent to a top smooth portion of an edge ofeach of said projecting pressure cutting blades by a grinding process sothat said inclined finishing surfaces make an angle φ of 50°-90° toridgelines defining said top smooth portion, said projecting pressurecutting blades extending in axial and circumferential directions of saidrotary driving roll, at least one of an edge width and an apex angle ofsaid projecting pressure cutting blades extending in the axial directionof said rotary driving roll being smaller than a corresponding one of anedge width and an apex angle of said projecting pressure cutting bladesextending in the circumferential direction of said rotary driving roll.